From: Eberhard Beilharz <eb1@sil.org>
Date: Fri, 16 May 2014 16:11:07 +0000 (+0200)
Subject: [MWF] Fix opacity of form (#19856)
X-Git-Url: http://wien.tomnetworks.com/gitweb/?a=commitdiff_plain;h=2614e55bee11d7b505d923ebe268e6f706310a21;p=mono.git

[MWF] Fix opacity of form (#19856)
---

diff --git a/mcs/class/Managed.Windows.Forms/System.Windows.Forms/XplatUIX11.cs b/mcs/class/Managed.Windows.Forms/System.Windows.Forms/XplatUIX11.cs
index c2512403392..a837d2ceda5 100644
--- a/mcs/class/Managed.Windows.Forms/System.Windows.Forms/XplatUIX11.cs
+++ b/mcs/class/Managed.Windows.Forms/System.Windows.Forms/XplatUIX11.cs
@@ -6109,12 +6109,13 @@ namespace System.Windows.Forms {
 			}
 
 			hwnd.opacity = (uint)(0xffffffff * transparency);
-			opacity = (IntPtr)((int)hwnd.opacity);
+			opacity = (IntPtr)hwnd.opacity;
 
-			IntPtr w = hwnd.whole_window;
-			if (hwnd.reparented)
-				w = XGetParent (hwnd.whole_window);
-			XChangeProperty(DisplayHandle, w, _NET_WM_WINDOW_OPACITY, (IntPtr)Atom.XA_CARDINAL, 32, PropertyMode.Replace, ref opacity, 1);
+			if (transparency >= 1.0) {
+				XDeleteProperty (DisplayHandle, hwnd.whole_window, _NET_WM_WINDOW_OPACITY);
+			} else {
+				XChangeProperty (DisplayHandle, hwnd.whole_window, _NET_WM_WINDOW_OPACITY, (IntPtr)Atom.XA_CARDINAL, 32, PropertyMode.Replace, ref opacity, 1);
+			}
 		}
 
 		internal override bool SetZOrder(IntPtr handle, IntPtr after_handle, bool top, bool bottom)